Other Parts Discussed in Thread: DP83867IR
Team
some end customer of one of my customers (users of the product) use Ethernet cables with only two pairs of wires to limit the speed to 100 Mbps. This is not single pair ethernet.
Here's a decription of their issue:
"Now, however, the issue is that the PHY will detect a valid Gb connection if the link partner supports it. However, because the cable does not allow data transfer, no connection is established between the link partners. In the manual I discovered that with certain register settings the "Speed Optimization" can be switched on, which should reduce the speed to 100 Mbit/s. However, the PHY detects a valid link, which does not enable Speed Optimization in the first place. If this connection were invalid, speed optimization would be activated and switched to a 100 Mbit connection. According to the manual, the criteria for link construction are "implementation-specific". I was unable to find any further information on how to change these criteria. The goal is to change the "link validity criteria" so that a Gb link is not valid if only two pairs of lines are used.
Is there any way to change these criteria? Or is it generally not possible to use a cable with only two pairs of wires between two Gigabit Link partners? "
BR
